/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2006 by Michael Sevakis * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include #include "system.h" #include "kernel.h" #include "logf.h" #include "audio.h" #include "sound.h" #include "pcm.h" #include "pcm_sampr.h" #include "pcm-internal.h" /** DMA **/ #ifdef CPU_PP502x /* 16-bit, L-R packed into 32 bits with left in the least significant halfword */ #define SAMPLE_SIZE 16 /* DMA Requests from IIS, Memory to peripheral, single transfer, wait for DMA request, interrupt on complete */ #define DMA_PLAY_CONFIG ((DMA_REQ_IIS << DMA_CMD_REQ_ID_POS) | \ DMA_CMD_RAM_TO_PER | DMA_CMD_SINGLE | \ DMA_CMD_WAIT_REQ | DMA_CMD_INTR) /* DMA status cannot be viewed from outside code in control because that can * clear the interrupt from outside the handler and prevent the handler from * from being called. Split up transfers to a reasonable size that is good as * a timer, obtaining a keyclick position and peaking yet still keeps the * FIQ count low. */ #define MAX_DMA_CHUNK_SIZE (pcm_curr_sampr >> 6) /* ~1/256 seconds */ #else /* 32-bit, one left 32-bit sample followed by one right 32-bit sample */ #define SAMPLE_SIZE 32 #endif struct dma_data { /* NOTE: The order of size and p is important if you use assembler optimised fiq handler, so don't change it. */ union { unsigned long addr; uint32_t *p16; /* For packed 16-16 stereo pairs */ uint16_t *p32; /* For individual samples converted to 32-bit */ }; size_t size; #if NUM_CORES > 1 unsigned core; #endif int locked; int state; }; extern void *fiq_function; /* Dispatch to the proper handler and leave the main vector table alone */ void fiq_handler(void) ICODE_ATTR __attribute__((naked)); void fiq_handler(void) { asm volatile ( "ldr pc, [pc, #-4] \n" "fiq_function: \n" ".word 0 \n" ); } #ifdef HAVE_PCM_DMA_ADDRESS void * pcm_dma_addr(void *addr) { if (addr != NULL && (unsigned long)addr < UNCACHED_BASE_ADDR) addr = UNCACHED_ADDR(addr); return addr; } #endif /* TODO: Get simultaneous recording and playback to work. Just needs some tweaking */ /**************************************************************************** ** Playback DMA transfer **/ static struct dma_data dma_play_data IBSS_ATTR = { /* Initialize to a locked, stopped state */ { .addr = 0 }, .size = 0, #if NUM_CORES > 1 .core = 0x00, #endif .locked = 0, .state = 0 }; void pcm_dma_apply_settings(void) { audiohw_set_frequency(pcm_fsel); } #if defined(CPU_PP502x) /* NOTE: direct stack use forbidden by GCC stack handling bug for FIQ */ void ICODE_ATTR __attribute__((interrupt("FIQ"))) fiq_playback(void) { bool new_buffer = false; register size_t size; DMA0_STATUS; /* Clear any pending interrupt */ size = (DMA0_CMD & 0xffff) + 4; /* Get size of trasfer that caused this interrupt */ dma_play_data.addr += size; dma_play_data.size -= size; while (1) { if (dma_play_data.size > 0) { size = MAX_DMA_CHUNK_SIZE; /* Not at least MAX_DMA_CHUNK_SIZE left or there would be less * than a FIFO's worth of data after this transfer? */ if (size + 16*4 > dma_play_data.size) size = dma_play_data.size; /* Set the new DMA values and activate channel */ DMA0_RAM_ADDR = dma_play_data.addr; DMA0_CMD = DMA_PLAY_CONFIG | (size - 4) | DMA_CMD_START; if (new_buffer) pcm_play_dma_started_callback(); return; } new_buffer = true; /* Buffer empty. Try to get more. */ pcm_play_get_more_callback((void **)&dma_play_data.addr, &dma_play_data.size); if (dma_play_data.size == 0) { /* No more data */ return; } if (dma_play_data.addr < UNCACHED_BASE_ADDR) { /* Flush any pending cache writes */ dma_play_data.addr = UNCACHED_ADDR(dma_play_data.addr); commit_discard_idcache(); } } } #else /* ASM optimised FIQ handler. Checks for the minimum allowed loop cycles by * evalutation of free IISFIFO-slots against available source buffer words. * Through this it is possible to move the check for IIS_TX_FREE_COUNT outside * the loop and do some further optimization. Right after the loops (source * buffer -> IISFIFO) are done we need to check whether we have to exit FIQ * handler (this must be done, if all free FIFO slots were filled) or we will * have to get some new source data. Important information kept from former * ASM implementation (not used anymore): GCC fails to make use of the fact * that FIQ mode has registers r8-r14 banked, and so does not need to be saved. * This routine uses only these registers, and so will never touch the stack * unless it actually needs to do so when calling pcm_callback_for_more. * C version is still included below for reference and testing. */ #if 1 void fiq_playback(void) ICODE_ATTR __attribute__((naked)); void fiq_playback(void) { /* r10 contains IISCONFIG address (set in crt0.S to minimise code in actual * FIQ handler. r11 contains address of p (also set in crt0.S). Most other * addresses we need are generated by using offsets with these two. * r10 + 0x40 is IISFIFO_WR, and r10 + 0x0c is IISFIFO_CFG. * r8 and r9 contains local copies of p and size respectively. * r0-r3 and r12 is a working register. */ asm volatile ( "stmfd sp!, { r0-r4, lr } \n" /* stack scratch regs and lr */ "mov r4, #0 \n" /* Was the callback called? */ #if CONFIG_CPU == PP5002 "ldr r12, =0xcf001040 \n" /* Some magic from iPodLinux */ "ldr r12, [r12] \n" #endif "ldmia r11, { r8-r9 } \n" /* r8 = p, r9 = size */ "cmp r9, #0 \n" /* is size 0? */ "beq .more_data \n" /* if so, ask pcmbuf for more data */ #if SAMPLE_SIZE == 16 ".check_fifo: \n" "ldr r0, [r10, %[cfg]] \n" /* read IISFIFO_CFG to check FIFO status */ "and r0, r0, %[mask] \n" /* r0 = IIS_TX_FREE_COUNT << 16 (PP502x) */ "mov r1, r0, lsr #16 \n" /* number of free FIFO slots */ "cmp r1, r9, lsr #2 \n" /* number of words from source */ "movgt r1, r9, lsr #2 \n" /* r1 = amount of allowed loops */ "sub r9, r9, r1, lsl #2 \n" /* r1 words will be written in following loop */ "subs r1, r1, #2 \n" ".fifo_loop_2: \n" "ldmgeia r8!, {r2, r12} \n" /* load four samples */ "strge r2 , [r10, %[wr]] \n" /* write sample 0-1 to IISFIFO_WR */ "strge r12, [r10, %[wr]] \n" /* write sample 2-3 to IISFIFO_WR */ "subges r1, r1, #2 \n" /* one more loop? */ "bge .fifo_loop_2 \n" /* yes, continue */ "tst r1, #1 \n" /* two samples (one word) left? */ "ldrne r12, [r8], #4 \n" /* load two samples */ "strne r12, [r10, %[wr]] \n" /* write sample 0-1 to IISFIFO_WR */ #elif SAMPLE_SIZE == 32 ".check_fifo: \n" "ldr r0, [r10, %[cfg]] \n" /* read IISFIFO_CFG to check FIFO status */ "and r0, r0, %[mask] \n" /* r0 = IIS_TX_FREE_COUNT << 23 (PP5002) */ "movs r1, r0, lsr #24 \n" /* number of free pairs of FIFO slots */ "beq .fifo_fill_complete \n" /* no complete pair? -> exit */ "cmp r1, r9, lsr #2 \n" /* number of words from source */ "movgt r1, r9, lsr #2 \n" /* r1 = amount of allowed loops */ "sub r9, r9, r1, lsl #2 \n" /* r1 words will be written in following loop */ ".fifo_loop: \n" "ldr r12, [r8], #4 \n" /* load two samples */ "mov r2 , r12, lsl #16 \n" /* put left sample at the top bits */ "str r2 , [r10, %[wr]] \n" /* write top sample to IISFIFO_WR */ "str r12, [r10, %[wr]] \n" /* write low sample to IISFIFO_WR*/ "subs r1, r1, #1 \n" /* one more loop? */ "bgt .fifo_loop \n" /* yes, continue */ ".fifo_fill_complete: \n" #endif "cmp r4, #0 \n" /* If fill came after get_more... */ "beq .still_old_buffer \n" "mov r4, #0 \n" "ldr r2, =pcm_play_dma_started \n" "ldrne r2, [r2] \n" "cmp r2, #0 \n" "movne lr, pc \n" "bxne r2 \n" ".still_old_buffer: \n" "cmp r9, #0 \n" /* either FIFO is full or source buffer is empty */ "bgt .exit \n" /* if source buffer is not empty, FIFO must be full */ ".more_data: \n" "mov r4, #1 \n" /* Remember we did this */ "ldr r2, =pcm_play_get_more_callback \n" "mov r0, r11 \n" /* r0 = &p */ "add r1, r11, #4 \n" /* r1 = &size */ "mov lr, pc \n" /* call pcm_play_get_more_callback */ "bx r2 \n" "ldmia r11, { r8-r9 } \n" /* load new p and size */ "cmp r9, #0 \n" "bne .check_fifo \n" /* size != 0? refill */ ".exit: \n" /* (r9=0 if stopping, look above) */ "stmia r11, { r8-r9 } \n" /* save p and size */ "ldmfd sp!, { r0-r4, lr } \n" "subs pc, lr, #4 \n" /* FIQ specific return sequence */ ".ltorg \n" : /* These must only be integers! No regs */ : [mask]"i"(IIS_TX_FREE_MASK), [cfg]"i"((int)&IISFIFO_CFG - (int)&IISCONFIG), [wr]"i"((int)&IISFIFO_WR - (int)&IISCONFIG) ); } #else /* C version for reference */ void fiq_playback(void) __attribute__((interrupt ("FIQ"))) ICODE_ATTR; /* NOTE: direct stack use forbidden by GCC stack handling bug for FIQ */ void fiq_playback(void) { bool new_buffer = false; #if CONFIG_CPU == PP5002 inl(0xcf001040); #endif do { while (dma_play_data.size > 0) { if (IIS_TX_FREE_COUNT < 2) { if (new_buffer) { new_buffer = false; pcm_play_dma_started_callback(); } return; } #if SAMPLE_SIZE == 16 IISFIFO_WR = *dma_play_data.p16++; #elif SAMPLE_SIZE == 32 IISFIFO_WR = *dma_play_data.p32++ << 16; IISFIFO_WR = *dma_play_data.p32++ << 16; #endif dma_play_data.size -= 4; } if (new_buffer) { new_buffer = false; pcm_play_dma_started_callback(); } /* p is empty, get some more data */ pcm_play_get_more_callback((void **)&dma_play_data.addr, &dma_play_data.size); new_buffer = true; } while (dma_play_data.size); /* No more data */ } #endif /* ASM / C selection */ #endif /* CPU_PP502x */ /* For the locks, FIQ must be disabled because the handler manipulates IISCONFIG and the operation is not atomic - dual core support will require other measures */ void pcm_play_lock(void) { int status = disable_fiq_save(); if (++dma_play_data.locked == 1) { #ifdef CPU_PP502x CPU_INT_DIS = DMA_MASK; #else IIS_IRQTX_REG &= ~IIS_IRQTX; #endif } restore_fiq(status); } void pcm_play_unlock(void) { int status = disable_fiq_save(); if (--dma_play_data.locked == 0 && dma_play_data.state != 0) { #ifdef CPU_PP502x CPU_INT_EN = DMA_MASK; #else IIS_IRQTX_REG |= IIS_IRQTX; #endif } restore_fiq(status); } static void play_start_pcm(void) { fiq_function = fiq_playback; #ifdef CPU_PP502x /* Not at least MAX_DMA_CHUNK_SIZE left or there would be less than a * FIFO's worth of data after this transfer? */ size_t size = MAX_DMA_CHUNK_SIZE; if (size + 16*4 > dma_play_data.size) size = dma_play_data.size; DMA0_RAM_ADDR = dma_play_data.addr; DMA0_CMD = DMA_PLAY_CONFIG | (size - 4) | DMA_CMD_START; dma_play_data.state = 1; #else IISCONFIG &= ~IIS_TXFIFOEN; /* Stop transmitting */ /* Fill the FIFO or start when data is used up */ while (1) { if (IIS_TX_FREE_COUNT < 2 || dma_play_data.size == 0) { IISCONFIG |= IIS_TXFIFOEN; /* Start transmitting */ dma_play_data.state = 1; return; } #if SAMPLE_SIZE == 16 IISFIFO_WR = *dma_play_data.p16++; #elif SAMPLE_SIZE == 32 IISFIFO_WR = *dma_play_data.p32++ << 16; IISFIFO_WR = *dma_play_data.p32++ << 16; #endif dma_play_data.size -= 4; } #endif } static void play_stop_pcm(void) { #ifdef CPU_PP502x unsigned long status = DMA0_STATUS; /* Snapshot- resume from this point */ unsigned long cmd = DMA0_CMD; size_t size = 0; /* Stop transfer */ DMA0_CMD = cmd & ~(DMA_CMD_START | DMA_CMD_INTR); /* Wait for not busy + clear int */ while (DMA0_STATUS & (DMA_STATUS_BUSY | DMA_STATUS_INTR)); if (status & DMA_STATUS_BUSY) { /* Transfer was interrupted - leave what's left */ size = (cmd & 0xfffc) - (status & 0xfffc); } else if (status & DMA_STATUS_INTR) { /* Transfer was finished - DMA0_STATUS will have been reloaded * automatically with size in DMA0_CMD. Setup to restart on next * segment. */ size = (cmd & 0xfffc) + 4; } /* else not an active state - size = 0 */ dma_play_data.addr += size; dma_play_data.size -= size; if (dma_play_data.size == 0) dma_play_data.addr = 0; /* Entire buffer has completed. */ #else /* Disable TX interrupt */ IIS_IRQTX_REG &= ~IIS_IRQTX; #endif /* Wait for FIFO to empty */ while (!IIS_TX_IS_EMPTY); dma_play_data.state = 0; } void pcm_play_dma_start(const void *addr, size_t size) { #if NUM_CORES > 1 /* This will become more important later - and different ! */ dma_play_data.core = processor_id(); /* save initiating core */ #endif pcm_play_dma_stop(); #ifdef CPU_PP502x if ((unsigned long)addr < UNCACHED_BASE_ADDR) { /* Flush any pending cache writes */ addr = UNCACHED_ADDR(addr); commit_discard_idcache(); } dma_play_data.addr = (unsigned long)addr; dma_play_data.size = size; DMA0_PER_ADDR = (unsigned long)&IISFIFO_WR; DMA0_FLAGS = DMA_FLAGS_UNK26; DMA0_INCR = DMA_INCR_RANGE_FIXED | DMA_INCR_WIDTH_32BIT; #else dma_play_data.addr = (unsigned long)addr; dma_play_data.size = size; #endif play_start_pcm(); } /* Stops the DMA transfer and interrupt */ void pcm_play_dma_stop(void) { play_stop_pcm(); dma_play_data.addr = 0; dma_play_data.size = 0; #if NUM_CORES > 1 dma_play_data.core = 0; /* no core in control */ #endif } void pcm_play_dma_pause(bool pause) { if (pause) { play_stop_pcm(); } else { play_start_pcm(); } } size_t pcm_get_bytes_waiting(void) { return dma_play_data.size & ~3; } void pcm_play_dma_init(void) { /* Initialize default register values. */ audiohw_init(); #ifdef CPU_PP502x /* Enable DMA controller */ DMA_MASTER_CONTROL |= DMA_MASTER_CONTROL_EN; /* FIQ priority for DMA */ CPU_INT_PRIORITY |= DMA_MASK; /* Enable request?? Not setting or clearing everything doesn't seem to * prevent it operating. Perhaps important for reliability (how requests * are handled). */ DMA_REQ_STATUS |= 1ul << DMA_REQ_IIS; DMA0_STATUS; #else /* Set up banked registers for FIQ mode */ /* Use non-banked registers for scratch. */ register volatile void *iiscfg asm("r0") = &IISCONFIG; register volatile void *dmapd asm("r1") = &dma_play_data; asm volatile ( "mrs r2, cpsr \n" /* Save mode and interrupt status */ "msr cpsr_c, #0xd1 \n" /* Switch to FIQ mode */ "mov r8, #0 \n" "mov r9, #0 \n" "mov r10, %[iiscfg] \n" "mov r11, %[dmapd] \n" "msr cpsr_c, r2 \n" : : [iiscfg]"r"(iiscfg), [dmapd]"r"(dmapd) : "r2"); /* FIQ priority for I2S */ CPU_INT_PRIORITY |= IIS_MASK; CPU_INT_EN = IIS_MASK; #endif IISCONFIG |= IIS_TXFIFOEN; } void pcm_play_dma_postinit(void) { audiohw_postinit(); } const void * pcm_play_dma_get_peak_buffer(int *count) { unsigned long addr, size; int status = disable_fiq_save(); addr = dma_play_data.addr; size = dma_play_data.size; restore_fiq(status); *count = size >> 2; return (void *)((addr + 2) & ~3); } /**************************************************************************** ** Recording DMA transfer **/ #ifdef HAVE_RECORDING /* PCM recording interrupt routine lockout */ static struct dma_data dma_rec_data IBSS_ATTR = { /* Initialize to a locked, stopped state */ { .addr = 0 }, .size = 0, #if NUM_CORES > 1 .core = 0x00, #endif .locked = 0, .state = 0 }; /* For the locks, FIQ must be disabled because the handler manipulates IISCONFIG and the operation is not atomic - dual core support will require other measures */ void pcm_rec_lock(void) { int status = disable_fiq_save(); if (++dma_rec_data.locked == 1) IIS_IRQRX_REG &= ~IIS_IRQRX; restore_fiq(status); } void pcm_rec_unlock(void) { int status = disable_fiq_save(); if (--dma_rec_data.locked == 0 && dma_rec_data.state != 0) IIS_IRQRX_REG |= IIS_IRQRX; restore_fiq(status); } /* NOTE: direct stack use forbidden by GCC stack handling bug for FIQ */ void fiq_record(void) ICODE_ATTR __attribute__((interrupt ("FIQ"))); #if defined(SANSA_C200) || defined(SANSA_E200) void fiq_record(void) { register int32_t value; if (audio_channels == 2) { /* RX is stereo */ while (dma_rec_data.size > 0) { if (IIS_RX_FULL_COUNT < 2) { return; } /* Discard every other sample since ADC clock is 1/2 LRCK */ value = IISFIFO_RD; IISFIFO_RD; *dma_rec_data.p16++ = value; dma_rec_data.size -= 4; /* TODO: Figure out how to do IIS loopback */ if (audio_output_source != AUDIO_SRC_PLAYBACK) { if (IIS_TX_FREE_COUNT >= 16) { /* Resync the output FIFO - it ran dry */ IISFIFO_WR = 0; IISFIFO_WR = 0; } IISFIFO_WR = value; IISFIFO_WR = value; } } } else { /* RX is left channel mono */ while (dma_rec_data.size > 0) { if (IIS_RX_FULL_COUNT < 2) { return; } /* Discard every other sample since ADC clock is 1/2 LRCK */ value = IISFIFO_RD; IISFIFO_RD; value = (uint16_t)value | (value << 16); *dma_rec_data.p16++ = value; dma_rec_data.size -= 4; if (audio_output_source != AUDIO_SRC_PLAYBACK) { if (IIS_TX_FREE_COUNT >= 16) { /* Resync the output FIFO - it ran dry */ IISFIFO_WR = 0; IISFIFO_WR = 0; } value = *((int32_t *)dma_rec_data.p16 - 1); IISFIFO_WR = value; IISFIFO_WR = value; } } } pcm_rec_more_ready_callback(0, (void *)&dma_rec_data.addr, &dma_rec_data.size); } #else void fiq_record(void) { while (dma_rec_data.size > 0) { if (IIS_RX_FULL_COUNT < 2) { return; } #if SAMPLE_SIZE == 16 *dma_rec_data.p16++ = IISFIFO_RD; #elif SAMPLE_SIZE == 32 *dma_rec_data.p32++ = IISFIFO_RD >> 16; *dma_rec_data.p32++ = IISFIFO_RD >> 16; #endif dma_rec_data.size -= 4; } pcm_rec_more_ready_callback(0, (void *)&dma_rec_data.addr, &dma_rec_data.size); } #endif /* SANSA_E200 */ void pcm_rec_dma_stop(void) { /* disable interrupt */ IIS_IRQRX_REG &= ~IIS_IRQRX; dma_rec_data.state = 0; dma_rec_data.size = 0; #if NUM_CORES > 1 dma_rec_data.core = 0x00; #endif /* disable fifo */ IISCONFIG &= ~IIS_RXFIFOEN; IISFIFO_CFG |= IIS_RXCLR; } void pcm_rec_dma_start(void *addr, size_t size) { pcm_rec_dma_stop(); dma_rec_data.addr = (unsigned long)addr; dma_rec_data.size = size; #if NUM_CORES > 1 /* This will become more important later - and different ! */ dma_rec_data.core = processor_id(); /* save initiating core */ #endif /* setup FIQ handler */ fiq_function = fiq_record; /* interrupt on full fifo, enable record fifo interrupt */ dma_rec_data.state = 1; /* enable RX FIFO */ IISCONFIG |= IIS_RXFIFOEN; /* enable IIS interrupt as FIQ */ CPU_INT_PRIORITY |= IIS_MASK; CPU_INT_EN = IIS_MASK; } void pcm_rec_dma_close(void) { pcm_rec_dma_stop(); } /* pcm_close_recording */ void pcm_rec_dma_init(void) { pcm_rec_dma_stop(); } /* pcm_init */ const void * pcm_rec_dma_get_peak_buffer(void) { return (void *)((unsigned long)dma_rec_data.addr & ~3); } /* pcm_rec_dma_get_peak_buffer */ #endif /* HAVE_RECORDING */